I’m white, so my opinion maybe doesn’t count.
I find black people (some black people) seem to have issues with darker than a brown paper bag black (their term, which I think is awful, and I never use it, but just making a point how some of them talk about it). I never hear white people making a big thing about it. Maybe black people see all white people the same, while some whites see blonde and blue eyed different than olive skin and dark hair? I have no idea. I remember once in Oprah, this woman (a black woman) got preggers by a very dark black man, and she hoped and prayed her baby wouldn’t be that dark. Well, he was. The kid was a teenager on the show, and his mom’s concerns had killed this kid’s self esteem. I couldn’t believe it. He felt like he would never be able to accomplish anything because if his color. I was quite appalled.
In my opinion, and again I don’t think my opinion really matters. I think it’s fine for Smith to play the part. They can make his skin a little darker, but probably then everyone will freak out about that. Smith possibly protects his skin from the sun, while Willians maybe doesn’t. That could account for a few shades darker. I used to work with this black girl who in the summer used to love to get really dark. She was from the islands, and I think the darker color was how she was used to seeing herself maybe?
My guess is, very dark African Americans feel they are discriminated against, and want a fair shot.